EP4230155A1 - Améliorations apportées aux arbres flexibles, aux dispositifs de fixation et à leurs outils d'insertion - Google Patents

Améliorations apportées aux arbres flexibles, aux dispositifs de fixation et à leurs outils d'insertion Download PDF

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Publication number
EP4230155A1
EP4230155A1 EP22184773.4A EP22184773A EP4230155A1 EP 4230155 A1 EP4230155 A1 EP 4230155A1 EP 22184773 A EP22184773 A EP 22184773A EP 4230155 A1 EP4230155 A1 EP 4230155A1
Authority
EP
European Patent Office
Prior art keywords
guide rod
section
periphery
fastening device
interior channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22184773.4A
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German (de)
English (en)
Inventor
William R. Krause
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Flex Technology Inc
Flex Technologies Inc
Original Assignee
Flex Technology Inc
Flex Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US17/652,094 external-priority patent/US20220240997A1/en
Application filed by Flex Technology Inc, Flex Technologies Inc filed Critical Flex Technology Inc
Publication of EP4230155A1 publication Critical patent/EP4230155A1/fr
Pending legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/72—Intramedullary pins, nails or other devices
    • A61B17/7291—Intramedullary pins, nails or other devices for small bones, e.g. in the foot, ankle, hand or wrist
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/1613—Component parts
    • A61B17/1631—Special drive shafts, e.g. flexible shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue
    • A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • A61B17/8886—Screwdrivers, spanners or wrenches holding the screw head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8897—Guide wires or guide pins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
    • A61B17/8615—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the central region of the screw head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • A61B17/8877—Screwdrivers, spanners or wrenches characterised by the cross-section of the driver bit
    • A61B17/888—Screwdrivers, spanners or wrenches characterised by the cross-section of the driver bit the driver bit acting on the central region of the screw head

Definitions

  • the present invention pertains to flexible shafts, fastening devices and a tool assembly and system for manipulating rotational devices, such as fastening devices and reamers.
  • flexible fastening devices encompasses a broad spectrum of industries, included, but not limited to, manufacturing, construction, mining, transportation, agriculture, aviation, automotive, and medical.
  • Flexible fastening devices either tipped like screws or flat end like bolts, have the characteristics of the cylindrical portion of the device being bendable about the longitudinal length.
  • Flexible fastening devices are useable in many applications, from manufacturing to medical, to secure two objects together.
  • flexible fastening devices are used to join curved members together, to join misaligned holes, to absorb vibration between two components, and numerous other applications.
  • flexible devices are used to connect two or more members whereby a straight passage of the bolt is impossible and a curved passage in one member allows the inserted flexible fastening device or bolt to follow the passage and be joined to another member.
  • two curved tubes can be connected by inserting a flexible bolt through the internal diameter of one to thread into the internal diameter of the other tube to join them together.
  • Bone fastening devices are typically used as internal fixation to anchor the fixation system to the relevant bone portions or to join two or more fragments of a fractured bone into close proximity for bone union.
  • fastening devices can be used in plate or rod systems to treat complex fractures of long bones or conditions such as vertebral instability.
  • small bone fractures such as the bones of the hands, feet, and wrist
  • the fastening device is placed across the fracture site to bring the fracture surfaces in close proximity.
  • medium (clavicle, rib and others) and long (lower and upper extremities) bone fractures fastening devices can be inserted into the intramedullary canal for minimally invasive fracture reduction.
  • a fixation device is a compression bone fixation fastening device, or compression fastening device, used to fixate two or more bone fragments or intramedullary fixation of a bone.
  • a guide wire is inserted through the fractured bone to align the fragments and provide a path for canal enlargement tools and the fastening device to follow.
  • a surgical fastening devicedriver or insertion tool having a drive shaft for rotating the fastening device and advancing it along the inserted guide wire is commonly used to insert bone fastening devices.
  • the driver cooperatively engages with a drive recess, within the proximal end of the fastening device, to help achieve axial alignment of the fastening device with the drive shaft of the screwdriver.Improvement of fastening devices and insertion tools is needed to prevent rotation of the screwdriver with the guide wire over which the fastening device is placed.
  • a system for manipulating a rotational device such as a flexible or non-flexible fastening device, compression fastening device, or reamer using a flexible guide rod with an external rod feature along its entire or partial length to engage a rotational device with a complementary interior channel feature along its length is disclosed.
  • a driver having a handle and coupling element is coupled to the rotational device while the flexible guide rod extends from the handle, through the coupling element, and into the interior channel of the rotational device in order to rotate from within along the length of the device, thus avoiding twisting of the rotational device.
  • the flexible guide rod has a distal section, mid-section, and proximal threaded section.
  • the rotational device has an exterior, a distal end, and an open, non-circular, interior channel.
  • the open interior channel has a distal section, mid-section, and proximal section.
  • the distal section of the interior channel has a periphery greater or equal tothan the periphery of the distal section of the flexible guide rod and is dimensioned to receive the periphery of the proximal section of the flexible guide rod.
  • the periphery of the proximal section of the interior channel periphery is configured to receive a driver coupling element.
  • the external rod feature extends along at least a portion of the mid-section and proximal threaded section of the guide rod to interact with the complimentary interior channel feature of the rotational device.
  • the periphery of the interior channel mid-section interacts with the periphery of the guide rod mid-section and secures the distal section of the guide rod within the distal section of the interior channel at a transitional point once the guide rod is received by the distal section of the interior channel.
  • the disclosed system can use any complementary external rod feature and interior channel feature that allows minimum rotation and prevents complete rotation, preferably less than 10 degrees, of the guide rod within the channel of the rotational device.
  • the preferred complementary configuration of the features is a flat to form a D-shape and where the flat is between 25 to 75 percent of a radius of said guide rod.
  • fastening device As used herein the terms “fastening device”, “flexible rotating shaft”,”flexible device”, “screw”, and “bolt” shall be used interchangeably and reference any flexible device that can secure two or more objects together.
  • the term “manipulating” shall refer to inserting, removing, tightening, loosening, or adjusting of a fastening device; the terms “manipulation” or “manipulating” can be used interchangeably with “drive” or “driving” or “driven”.
  • compression fastening device shall refer to any flexible device that can secure two or more objects together and tighten the contact through causing the fastening device to shorten.
  • distal shall refer to situation closer to the point of interaction between the tool assembly and an intended element.
  • proximal shall refer to situation farther away from the point of interaction between the tool assembly and an intended element.
  • element shall refer to any object or objects requiring the manipulation of a fastening device.
  • the features incorporated into the flexible devices such as, but limited to, fastening devices, reamers, fastening device drivers and other flexible instrument shafts include an interior shape or cross section that is complimentary to an inserted guide rod.
  • the screwdriver or insertion tool has means of preventing rotation of the screwdriver with the guide wire over which the fastening device is placed.
  • the fastening device can then be driven from both the driver receiving area at the proximal end and the interior channel.
  • the fastening device can be inserted, removed, tightened, loosened, or otherwise adjusted as needed by application of rotary force along the length of the bodyor a section within the interior of the device. This is especially applicable when the deviceis flexible and canbe in a curved orientation, through which the rod must pass to enter the distal end of the fastening device.
  • the ideal choice of material for the guide rod portion of this application is Nitinol, a nickel-titanium alloy, although other metallic alloys or flexible polymers and composites meeting the criteria set forth herein are applicable.
  • the rod can also be used to insert the fastening device.
  • the driver when coupled with a driving attachment to the proximal end of the fastening device, the driver would be applying the driving torque to both the proximal end and the length of the fastening device, thus relieving the twisting of the central flexible segment of the fastening device.
  • the insertion rod and internal complimentary shaped internal cavity are shown as "D-shaped", any complimentary shapes that do not allow rotation relative to one another are applicable.
  • removal of a fastening device using the interior channel also facilitates removal when the fastening device, or device, is broken.
  • the complimentary rod can be used to rotate the fastening device in the opposite direction from insertion, resulting in the fastening device backing itself out.
  • the D-shape disclosed herein as the complimentary shape provides maximized thread area for the locking nut in addition to increased contact between the length of the guide rod and the entire length of the fastener.
  • These D-shape features prevent angular deflection along the length of the fastener during insertion or removal.
  • the distal end of the fastener and the distal end of the guide rod must both have complimentary configurations that maintain the distal end of the guide rod at the distal end of the fastener in order to compress the fastener if necessary. This can be accomplished in a number of methods and beyond those mentioned herein will be known to those skilled in the art.
  • interior cross section will have a "D" shaped periphery although other shapes, such as a multi-sided (but limited to a 2 sided, hex, square, octagon, elliptical) configuration would accomplish the same purpose; to prevent rotation of the guide rod with the device.
  • the interior distal end of the of the fastenercan have a recess that can be a slight taper of 1- 2 degrees to receive the complimentary distal tip of the guide rod.
  • the tapered end of the guide rod can be produced as part of a single rod, it can increase the cost depending on the material of manufacture.
  • the guide rod can have a consistent diameter and a tapered tip welded onto the distal end. This can be accomplished more easily by having a sleeve 161( Figure 12A) secured over the distal end to provide reinforcement and to provide a smooth surface.
  • the guide rod distal tip can have an untapered diameteror bulb end slightly larger than the body of the guide rod.
  • the interior distal end of the fastener would have an interior dimension equal to that of the guide rod distal tip with the diameter of the interior body of the fastener being dimensioned to receive the body of the guide rod. This would form a "step" that when inserted from the distal end, the guide rod tip would be prevented from entering the interior channel of the fastener by the step produced by the change in interior diameters.
  • the distal tip is larger than the diameter of the outer size of the fastener. Both instances, the distal tip would prevent the fastening device from being driven past the end of the guide rod.
  • a distal tip of the guide rod having adiameter equal to or less than the interior diameter of the distal section of the fastening device would allow removal of the guide rod while leaving the fastening device in place if the situation warranted.
  • the guide rod distal tip is absent, and the guide rod can be removed from the fastening device after insertion into the object's mating parts.
  • the embodiment illustrated in Figure 1 shows the tool assembly 100 illustrating the handle sub-assembly200 and attached fastening device 150 in accordance with the disclosed invention for the manipulation of fastening devices such as insertion, removal, tightening, loosening, or other adjustment.
  • the handle sub-assembly 200in combination with the guide rod 120 enables the manipulation of both flexible, as well as inflexible, fastening devices.
  • the handle sub-assembly 200 comprises a handle 210, a handle shank220, a coupling mechanism 230, guide rod holder clamp 250, guide rod holder clamp screw 255,and a guide rod holder238.
  • the coupling mechanism 230 has an external configuration to interact with the proximal end of the intended fastening device 150 as well as an internal configuration to interact with the proximal end of theguide rod 120.
  • the locking nut 270 is also illustrated in this figure although its use is optional and would generally be used after removal of the handle sub-assembly.
  • the guide rod sub-assembly 110 is composed of the guide rod 120 and fastening device 150 that are attached to the handle sub-assembly 200.
  • guide rod 120 is secured within the handle sub-assembly 200 by the guide rod holder 238 and guide rod holder clamp 250 while fastening device 150 is secured to the handle sub-assembly 200 by coupling mechanism 230.
  • the coupling mechanism 230 has an external configuration to interact with the proximal end of the intended fastening device 150.
  • Locking nut 270 is used to secure the guide rod 120, after removal of the handle sub-assembly 200, with the fastening device 150 to tighten the fastening device 150 with the guide rod 120.
  • the guide rod 120 although used as a single rod, is being referenced as three sections, proximal threaded section 121, mid-section 123, and tapered end section 125 as illustrated in Figures 3 - 7 .
  • Each of the sections 121, 123, and 125 have a periphery and diameter.
  • the periphery of distal section 125 is greater than the periphery of proximal section 121 and mid-section 123.
  • the rotational device has an exterior, a distal end, and an open interior channel.
  • the open interior channel has a distal section, mid-section, and proximal section.
  • the distal section of the interior channel has a periphery greater than or equal to the periphery of the distal section of the flexible guide rod and is dimensioned to receive the flexible guide rod.
  • the periphery of the proximal section of the interior channel periphery is configured to receive the coupling mechanism.
  • the guide rod 120 has a D-shaped cross-sectional shape ( Figure 7 ) extending along at least a portion of the mid-section 123 and proximal threaded section 121to interact with the complimentary interior channel surface 159 ( Figure 17A ) of the fastening device 150.
  • the length of the mid-section 123 of the guide rod must be less than the lengthof the fastening device 150 to enable the locking nut 270 to be screwed down to contact the proximal end of the fastening device 154 ( Figure 15C ).
  • the entire length of the guide rod 120 can be threaded. Whether threading the entire length or only a portion of the length will be dependent upon materials of manufacture and end use.
  • a rod clamp can be substituted for the locking nut to secure the rod 120 to the fastener 150.
  • the guide rod 120 illustrated in Detail A of Figure 4 illustrates the area between the threaded proximal section 121 and the mid-section 123.
  • Figure 5 illustrates the detail B showing the flat 130 of theD-shaped mid-section 123 and the end of the flat 130 at the juncture of the mid-section 123 and the tapered end section 125.
  • the tapered end section 125 as illustrated is tapered about 1 to 2 degrees to engage the tip of the fastening device as described hereinafter.
  • the guide rod 120 will be free to move toward the proximal end of the fastener 150 upon tightening of the locking nut 270.
  • the tightening of the lock nut 270 pulls the distal end of the fastener 150 toward the proximal end, compressing the fastening device 150 and thereby pulling the objects being secured tighter together.
  • Figure 6 is a detailed view of the fine threads 122 of the guide rod proximal threaded portion 121 of the guide rod 120.
  • the thread size used is appropriate for the diameter or shape of the rod as known in the art.
  • Figure 7 illustrates the cross-section of the D-shape used herein for both the guide rod 120 and the interior channel 159 of the fastener 150 or rotating device, such as the reamer of Figure 21 .
  • the portion of the guide rod 120 that forms the flat 130 is dependent upon the diameter of the guide rod 120 which in turn is dependent upon the end use.
  • the flat would be located between 25 to 75 percent of the radius of the rod's diameter as measured from the center.Changes to this percentage can vary in some end uses that will be known to those skilled in the art.
  • opposing sides of the guide rod can have flats or other unique and complimentary shapes. More than a single flat, as well as how much of the guide rod is removed, can compromise the integrity of the guide rod. The point at which integrity will be compromised depends on the materials being used and the end use and will be known by those skilled in the art.
  • Figure 8 illustrates an exploded view of theguide rod 120 inserted into the coupling mechanism 230 of the handle sub-assembly 200, through the handle shank 220 and exiting the handle 210.
  • the guide rod 120 is locked into position by the guide rod holder clamp 250 in combination with the guide rod holder 238.
  • the guide rod holder clamp 250 ( Figure 9D-F ) is inserted in clamp orifice 212 in the handle 210 such that the circular guide rod hole 254 is aligned with the circular guide rod shank passage 222 shown in Figures9B and 9C of the handle shank 220.
  • This alignment is necessary so that the guide rod holder shaft 244 can be inserted through holder shaft receiving area 211 into the guide rod shank passage 222.
  • Guide rod stop end 240 of the guide rod holder 238 prevents the guide rod holder 238 from passing through the passage.
  • the clamp screw threads 257 of the guide rod holder clamp screw 255 are inserted into the internal threads 252 of the guide rod holder clamp 250.
  • the guide rod holder clamp screw 255 is used to secure the guide rod holder shaft 244 of guide rod holder 238 in a stationary position within the guide rod shank passage 222 when it is inserted through the holder shaft receiving area 211 within the insertion handle 210. Prior to engagement of the guide rod holder clamp screw 255, the guide rod holder 238 is free to move within the passage.
  • a guide rod holder clamp screw 255 engaging with the threads 252 within the guide rod holder clamp 250 is an easy to manufacture method of preventing movement of the guide rod 120, other methods as known in the art can be used.
  • the guide rod shank passage 222 and the guide rod hole 254 can be aligned so the guide rod holder shaft 244 can be inserted through the guide rod holder clamp 250.
  • the threading of the guide rod holder clamp screw 255 draws the guide rod holder clamp 250 outwards relative to the insertion handle 210 thus locking the holder shaft 244 in place relative to the handle sub-assembly 200 and the fastening device 150. If it is desired to allow the rod to rotate relative to the handle sub-assembly 200 and the fastening device 150, the holder clamp 250 would not be tightened.
  • Figure 10 illustrates the side view of the guide rod holder 238, comprising the guide rod holder stop end 240, holder shaft 244, and the locations of sectional views D-D, and E-E.
  • Longitudinal section D-D is shown in Figure 11 illustrating the guide rod shaft passage 245 within holder shaft 244 and coupling mechanism 230 for the passage of the guide rod 120 through the guide rod holder 238.
  • the interior shape of the holder shaft 244 and thus the shape of guide rod shaft passage 245 is D-shaped as shown in Figure12 of Section E-E.
  • the guide rod holder 238 is illustrated in Figure 13 illustrating the D-shaped guide rod shaft passage.
  • the interior passages of the handle sub-assembly 200 are all circular.
  • the circular configuration enables the guide rod holder 238 to rotate unobstructed within the handle sub assembly 200 until the guide rod 120 is aligned with the D-shape configuration of the fastening device 150.
  • the guide rod shank passage 222 and the guide rod hole 254 are aligned so the guide rod holder shaft 244 can be inserted through the guide rod holder clamp 250, the guide rod holder 238 is inserted, with the D-shaped configuration of the guide rod shaft passage 245 matching the D-shaped configuration of the interior channel of the fastening device 150.
  • Figure 14 illustratesthe example fastening device 150, more detail and the interior of whichare illustrated in Figures16A-B and 17A-B .
  • the exterior of the fastening device 150 can take a number of configurations in length, width, and flexibility, and the example illustrated in Figure 14 is for example only.
  • FIG. 15A illustrates the fastening device 150, in this example a compression fastening devicethe flexible design of which is as described by Krause USPatent9,482,260 , with its proximal segment 154 containing proximal threads 158, distal segment 156 with distal threads 157, and central flexible segment 152 therebetween. Although the central segment illustrated herein is flexible, the interior configuration would remain the same for non-flexible devices.
  • Figure 15B the distal end 154 of the fastening device 150, indicated as Detail C, is illustrated. In this figure the locations of sections D-D and E-E as referenced in Figures 16A and 17A are identified.
  • Figure 15C illustrates the proximal end 154showing the threads 158 and the locking nut 270 adjacent the proximal end 154.
  • the location of B-B as illustrated in Figure 15C is also provided.
  • the threaded section 122 and the mid-section 123 of guide rod 120 are illustrated positioned within the proximal end of the fastening device 150.
  • the locking nut 270( Figures 18-20 ) and its threads 272 abutting the proximal end of the fastening device 150.
  • the flexible guide rod 120 has a distal section, mid-section, and proximal threaded section, with the mid-section and proximal section having like peripheries that are less than the periphery of the distal section.
  • the distal section of the interior channel has a periphery at least the size of the periphery of the distal section of the flexible guide rod and is dimensioned to receive the flexible guide rod.
  • the periphery of the proximal section of the interior channel periphery is configured to receive driver coupling element.
  • Figure 16A provides a detailed view of thetapered internal distal section D-Ddimensioned to receive the distal tapered section 125 that couples with the internal distal end 160 of fastening device.
  • the sleeve161 is used to form the taper to the tapered end section 125.
  • the use of the sleeve 161 as a method of creating a taper is described heretofore.
  • the internal diameter of the fastening device 150 changes at the internal change or transitional point 162,reducing the diameter to that of the tapered internal distal end 160 to the internal channel 159 and changingthe configuration of the D-shaped internal channel 159.
  • This internal change point 162 also serves, in addition to the tapered configurations, to lock the guide rod 120 in place.
  • the cross-sectional shape is preferably round for ease of manufacturing, however other shapes can be used.
  • the periphery of the interior channel mid-section secures the distal section of the guide rod within the distal section of the interior channel at a transitional point once the guide rod is received by the distal section of the interior channel.
  • the cross-sectional shape is preferably round for ease of manufacturing, however other shapes can be used.
  • the D-shaped channel 159 and the complimentary mid-section 123 is illustrated in the cross-sectional view of the fastener 150 illustrated in Figure 17A .
  • the complimentary configurations must be correctly dimensioned.
  • the cross-section F in Figure 17B shows the complimentary relationship between the interior channel159 and the mid-section 123 of the guide rod 120.
  • the guide rod rotates and interacts with the complimentary interior channel 159 of the fastening device 150.
  • the radius of the guide rod 120 is such that less than 10 degrees of rotation occurs between the interior channel 159 and the guide rod 120.
  • the gap 166 between the interior channel 159 and the guide rod mid-section 123 should provide torque transmission but not allow the guide rod 120 to rotate freely.
  • the dimensions are depending upon the diameter of the guide rod and interior of the device however for optimal rotation, with the overall diameter of the rod being less than the distance from the center of the fastening device to the flat.
  • Figure 18A illustrates the fastening device 150 having a unique interior cross section that is complimentary to the cross-sectional shape of the guide rod 120 as well asindicating the location of the proximal segment154 detail location G-G.
  • the driver receiving orifice 174 in the proximal segment154 is illustrated in Figure 18B where a feature of the driver receiving orifice 174, such as the flat surface 172, is reproduced along the length of the interior of the shaft 180.
  • the flat surface 172 does not have to run the entire length of the device, it is optimal that the interior flat surface 172 does run from the distal to proximal end along the interior of the shaft 180 to interact fully with the flat surface 130 of guide rod 120 or other inserting device.
  • the flat surface 171 is one of the flat edges of the driver hexagon referenced to the flat surface 172 machined in linear alignment along the interior length of the body 180. This combination enables seamless contact between the guide rod 120 and the driver tool. It is also advantageous that the flat surface 172 is parallel or referenced to a landmark in the driving receiver orifice such as the flat surface 170 of the hexagonal driver receiver orifice 174.
  • Figure 18C shows the cross-section G-G of Figure 18A to illustrate the cross-sectional shape of the receiving orifice 174 which in this configuration is a common hexagonal shape.
  • Other common types of driving orifices are known in the art.
  • Figure 18D illustrates the detail view H in Figure 18C to illustrate the flat surface 170 of the driver receiving orifice 174 that is complimentary to the flat surface 172 within the interior of the shaft 180 of the fastening device 150.
  • These surfaces are referred to as alignment surfaces.
  • the flat surface 172 is manufactured to be parallel and in alignment to the flat surface 170.
  • flat surfaces 170 and 172 are one example of configurations that can be used.
  • another application may be where the alignment surfaces are perpendicular to one another. The relationship between the surfaces in the fastening device 150 must be maintained in the associated tools.
  • Figures 19-21 illustrate the locking nut 270 containing threads 272 along section A-A.
  • the locking nut 270 has a projection 274 that is dimensioned to fit and rotate within the proximal receptacle 155.
  • the threads 272 are compatible with the threads 122 of the guide rod 120 and once the handle sub-assembly 200 removed guide rod locking nut 270is threaded onto the threaded portion 122.
  • the guide rod locking nut 270 is threaded down to the proximal end 154 of the fastening device 150, drawing the tapered end 125 of the guide rod 120 against the distal end 160 of the fastening device 150 to compress and stiffen the fastening device 150.
  • a second locking nut can be threaded down and secured. Once firmly in place, the guide rod 120 is cut off proximal to the guide rod locking nut 270.
  • a reamer 400 is illustrated having a flexible mid shaft body 402 and distal cutting end 406.
  • the reamer 400 has a D-shaped interior 404 ( Figures 22B and 22C) that, when placed over a guide rod 410 with the complimentary D-shaped flat 412 fitting against the flat 405 of the D-shaped interior channel 404, enhances rotation between the reamer 400 and the guide rod 410.
  • the distal end 414 of the guide rod 410 has, as disclosed previously, a diameter greater than the interior channel 404 of the reamer 400 to maintain the guide rod 410 within the reamer 400 during use and preventing the reamer 400from going past the end of the guide rod 410.
  • the proximal end 420 of the reamer 400 is configured to receive a driver such as a hand drill or other means known in the art. As disclosed heretofore, there are a number of complimentary cross-sectionalconfigurations for both the guide rod 410 and the reamer 402 that can be used to maintain the guide rod 410 in position.
  • the proximal end of the guide rod 410 is configured to receive a driver and can be any configuration compatible with the driver being used.
  • the reamer 400 is not fully positioned over the guide rod 410, extending slightly proximal to the distal tip 414 of the guide rod 410.
  • the guide rod 410 Prior to reaming the guide rod 410 would be fully inserted into a predrilled path within the objects to enable the reamer cutting edge 406 engage with the material of manufacture, enlarging the path,as the reamer is advanced down the guide rod 410.
  • the distal tip 414 prevents the reamer 400 from traveling past the end of guide rod.
  • the reamer 400 is removed, leaving the guide rod 120 in place.
  • the fastening device 150 is then inserted over the guide rod 120, following the reamed path.
  • Figure 23C illustrates a cross section of location B-B and detail C, clearly shows the positioning between the guide rod 410 flat 412 and the reamer 400 flat 405.
  • the dimensioning between the reamer 402 and the guide rod 410 are such that a slight space is left between the two elements as illustrated in Figure 23C and disclosed heretofore.
  • the dimensions between the radius of the guide rod 410 and the interior channel 404 will be dependent upon the overall diameters of the reamer and matching guide rod such that the guide rod cannot rotate freely within the reamer.
  • an extension bar when the device to be inserted is in a hard-to-reach location or further than the normal reach of the usual tool.
  • Such an extension bar for the disclosed fastening device150 is shown in Figure 24 and Figures 25A - D .
  • Figure 24 illustrates an extension device 500 for aiding in the insertion of the fastening device 150 when additional length is required than is provided by the tool assembly 100.
  • the extension shaft has a middle section 501, a distal tip 502 and proximal driving end 504.
  • the proximal driving end 504 example illustrated contains a receiving hole 515 to receive a set screw and secure the inner sleeve 510.
  • the distal tip 502 is configured to interact with the receiving orifice 174 of the fastening device 150 and would be substituted for the coupling mechanism 230 or other driver.
  • the driving end 504 is configured to receive a suitable driver, such as the tool assembly 100 or other attachment and handle.
  • Figure 25A illustrates the assembled extension device 500 with the inner sleeve 510 for aiding in the insertion of the fastening device 150, distal tip 502 for mating with the receiving orifice 174 of the fastening device 150, and proximal driving end 504 which is driven by a suitable handle.
  • Figure 25B shows the locations for sectional views C-C and D-D.
  • the guide rod alignment sleeve 510 is required when the alignment of the distal flat surface 170, or other distinct feature of the orifice174, is not oriented with the flat 172 within the interior of the shaft 180 of the fastening device150.
  • the interior of the outer extension device 500 and the exterior periphery of thealignment sleeve 510 are circular, leaving the alignment sleeve 510 free to rotate within the outer extension device 500, thereby enabling the guide rod 120 to be aligned with the D-shaped interior of the fastening device 150.
  • the interior cross-sectional shape 505of the alignment sleeve 510 iscomplimentary to the outer periphery of the guide rod 120 illustrated heretofore.
  • the extension device 500 has been assembled and ready to insert the guide rod 120 (not illustrated). Once assembled, the distal tip 502 is inserted in the driving orifice 174 of the fastening device 150 and the alignment sleeve 510 is locked on place.
  • the alignment sleeve 510 can be locked into place through the use of set screws, locking nuts or other means that will be known to those skilled in the art.
  • Figure 26 illustrates a manual screwdriver 550 with a distal tip 552, an extension shaft 554 and a handle 560.
  • the extension shaft 554 illustrated has a flexible shaft segment 555, however the entire shaft can be rigid, depending upon user preference and end use.
  • the shaft 554 can be either permanently attached to the handle 560 or inserted into the handle 560 for interchangeability of the shaft 550 for different sizes or shapes of the distal tip 552.
  • the handle 560 in this and other figures is marked "Flat Alignment Side" or other notification to facilitate alignment of the flat 170 of the fastening device 150.
  • Figure 27A illustrates the screwdriver 550 indicating the locations for sectional views B-B, C-C and D-D.
  • the cross-section B-B is illustrated in Figure 27B to show the unique interior cross-sectional shape 555 that is complimentary to the outer shape of the guide rod 120 as shown in Figure 7 .
  • Figure 27C shows the cross-sectional section C-C for illustration of the interior cross-sectional shape 556that allows uninhibited passageof the guide rod 120 as shown in Figure 7 .
  • the illustrated shape for the interior could be the continued unique interior cross-sectional shape555 displayed in Figure 27B .
  • Figure 27D show the cross-sectional section D-D of the handle 560 for illustration of the interior cross-sectional shape 566 that is complimentary to the outer shape of the guide rod 120 as shown in Figure 7 for a permanently attached shaft 550.
  • the illustrated shape for the interior 566 can be the outer cross-sectional shape of the shaft displayed in Figure 27B .
  • the handle 560 is illustrated in more detail in Figure 28 illustrating the orifice 567 for receiving a shaft 554( Figure 26 ) or an extension 580 as illustrated in Figure 30A .
  • a hole 561 is provide for alignment and locking with the extension drive 580 via the alignment and locking hole 587 using a commonly known in the art, set screw.
  • Figures 29A-B illustrate a driver bit 570 with a hex style drive end 574 and a bit shank 572.
  • the bit shank is shown with a hexagonal shape 573 although other shapes as known in the art can be used.
  • the central cannula 576 is configured with an alignment face 575 and shape complimentary to the exterior cross-sectional shape of the guide rod 120.
  • the side of the bit that is in alignment with the interior flat 575 is marked with an indicator, in this example "FLAT" 577.
  • FIG 30A illustrates an extension drive bar 580 for use with the handle 560 ( Figure 28 ) and the driver bit 570 ( Figures 29A-B ).
  • the extension drive 580 is comprised of the drive attachment shaft 586, the main body 584 and the bit attachment end 582.
  • the bit attachment 582 is shown with the most commonly used hexagonal shaped attachment interior shape 583.
  • the extension drive 580 has a central cannula 588 that allows for its passage over the guide rod 120.
  • the drive attachment shaft 586 has an alignment and locking hole 587 for mating with the handle 560 using a set screw.
  • Figure 30B shows the distal end 582 with a commonly used hexagonal shaped attachment interior shape 583 and the internal cavity 585.
  • Figure 30C shows the proximal end 586 and the cannulated orifice 588 extending through the extension drive bar 580.
  • Socket extension drives are used with sockets and hand drive tools to tighten and loosen fasteners. They connect between the drive end of the hand tool and the drive end of the socket to lengthen the reach of the tool so it can access fasteners in hard-to-reach locations.
  • Figure 31 illustrates the assembled insertion tool 590 comprised of the extension drive bar 580 with the handle 560 and the driver bit 570.
  • Figure 32 illustrates the application using a ratcheting handle 595 including the extension 580 with a ratchet handle 589 for faster insertion.
  • Figure 33 illustrates an assembled insertion unit 600 comprised of the fastening device 150, the drive bit 570, the extension rod 580 and the ratchet handle 595which would be placed over the guide rod 120 for insertion.
  • Figure 34A illustrates an assembled insertion unit 600 comprised of the fastening device 150, the drive bit 570, the extension rod 580 and the ratchet handle 595 with section A-A shown to display the differences in cross sectional shapes of the attachment area.
  • Figure 34B shows the sectional view A-A for describing the location of sections .C-C and D-D and detail view E.
  • Figure 34C shows the cross-sectionC-C of the fastening device 150 with the alignment surface 172.
  • Figure 34D shows the cross-sectionD-D of the hex bit 570 with the alignment face 575 parallel to alignment surface 172 of the fastening device 150.
  • Figure 34E shows the detail view E with the cannula of the fastening device 150, central cannula 576 and extension rod 588.
  • Figure 35 illustrates the different driver bit 570 with a hex style drive end 574 provided by commercial industrial supply companies.
  • the repair of a fractured clavicle is being described, however that is for example only.
  • the clavicle is reamed to the appropriate diameter.
  • the disclosed flexible guide rod 120 is passed past the fracture siteand the fastening device 150, which has been attached to the handle sub-assembly200, is inserted over the guide rod 120.
  • the guide rod 120 has been locked in place within the handle sub assembly 100 as described heretofore. Due to the D-shaped configurations of the guide rod 120 and the interior channel 159 of the fastening device 150, the insertion can only be accomplished when the two elements are in alignment.
  • the handle sub-assembly 200 is removed.
  • the remaining threaded segment 151 extends from the insertion point.
  • the locking nut 270 is placed on the threaded segment 151 and screwed down to the head of the fastening device 150, slightly compressing the fastening device 150.
  • the remaining threaded segment 151 is then cut to a predetermine distance from the proximal end of the fastening device 150.

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EP22184773.4A 2022-02-22 2022-07-13 Améliorations apportées aux arbres flexibles, aux dispositifs de fixation et à leurs outils d'insertion Pending EP4230155A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17/652,094 US20220240997A1 (en) 2019-03-13 2022-02-22 Tool for the Manipulation of Fastening Devices
EP22173923 2022-05-17

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EP4230155A1 true EP4230155A1 (fr) 2023-08-23

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140100616A1 (en) * 2012-10-09 2014-04-10 Warsaw Orthopedic, Inc. Surgical instrument and method
US20190008570A1 (en) * 2016-04-19 2019-01-10 Globus Medical, Inc. Implantable compression screws
US20200375750A1 (en) * 2018-06-15 2020-12-03 Advance Research System, Llc Systems and methods for fusion of sacroiliac joint

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140100616A1 (en) * 2012-10-09 2014-04-10 Warsaw Orthopedic, Inc. Surgical instrument and method
US20190008570A1 (en) * 2016-04-19 2019-01-10 Globus Medical, Inc. Implantable compression screws
US20200375750A1 (en) * 2018-06-15 2020-12-03 Advance Research System, Llc Systems and methods for fusion of sacroiliac joint

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